RCN Roamio-worth an extra 10-15/month?

I'm currently set up with an RCN Tivo Premiere whole home bundle (4 tuner premiere + Tivo Preview).

RCN just announced availability of their Roamio equivalent (T6) in my market. Unfortunately it's going to cost an extra 10-15/month (because of the way billing is set up it's a little opaque). I'm trying to decide if the Roamio package is worth it.

As I understand it the main benefits of the Roamio would be as follows

1. More storage-I have a 1TB external drive and we don't retain a ton of content so the greater storage isn't an issue for me.

2. 6 Tuners vs. 4 - I rarely have tuner conflict and enough of our shows run at multiple times that a little bit of conflict management gets me by.

3. Pause live TV on the mini vs. not on the Tivo Preview: This would be nice but isn't a huge priority for me.

4. Improved interface and speed. How do people feel about this? Is is it a dramatically different experience?

5. Any other benefits? Better video quality? Flattery and compliments? Will sing to my dog when we're out of the house?

As nice as the Roamio Plus/T6's are (fast, 6-tuners, RF remote, streaming to iDevices), $50/mo for a T6 and Mini seems like a bit of a ride to me.

Unless you do a lot of VOD, if you dislike your Premiere enough, I'd consider buying a discount code off of ebay and buying a Roamio Plus and Mini with Lifetime ($600 and $175 with code), and after only about a year and a half it'll have broken even with RCN's fees.